i really like your colours, and i think youve done well to establish your universe and the mood of your comic. its super cute.
id recommend rethinking your lettering a little. like, looking at these two bubbles:
wrt the first bubble: im gonna make two assumptions / educated guesses. correct me if im wrong. A: youre drawing your bubbles before writing and B: manga is a big influence in your work. the latter is fine, but the way translated mangas are lettered is far from the best way to letter your webcomic, because translated manga has to smoosh english into pre-existent bubbles, which were made for vertical text. if you put your text down first, before or during drawing (even just as a rough draft) you can prevent this squeezing. also, more specifically, always keep question marks connected to their word.
the second one is mainly also squashing, but really try to keep your lettering straight aside from effects; yours slants upwards, which makes it feel a little dizzy. also sometimes you have uneven pacing, which is similar. its all down to practice, so youll get better if you pay attention to it when you letter - although, you can always turn your handwriting into a font if you still have trouble with it. also, when drawing your bubbles, make sure you have an even space at all the bits where text nearly touches the edge - ive heard that if you can move an 'o' all around the space between the letters and the edge of the bubble, youre good.
another thing comics usually do for lettering is put their lettering into a diamond shape, for a circular bubble to go round it. it uses up the least space. you wouldnt need to do this for your vertical bubbles, of course, but its worth bearing in mind for rounder bubbles as another way to fit everything in.
i wish you the best of luck with betwixt, itll have no problem finding a following.
